To me 100g (about 1/4 lbs) wouldn't be super significant. However there's a 3 lbs difference between my similar height Jets and Stingers (60/90 and 75/90 respectively) due in large part to my tire selection on the Jets (same spokes, cassette, and almost identical hubs - with my Stinger 6s, 60/60, it's over 3 lbs and those use identical hubs). At 3 lbs I think it makes a difference when doing any kind of hard acceleration. In something, maybe Northeast Racing, I posted a power file from the P123 race last Sunday. I had numerous 500-700w spikes accelerating out of turns (I just looked for 5s intervals, there were 51 instances where I went over 500w for 5s). If those were a bit higher because I had to accelerate 3 more pounds of rim/tire weight, I think I'd have been making bigger efforts or I'd have gotten shelled. It's hard to calculate this stuff in a mass start type race because I could have accelerated a bit lighter (and kept the same power peaks) but that would have meant I would have had to have better position going into the turn. As it was I was dead last for a bit so I had no more drift back, no leeway, and with the pretty significant cross/headwind (depending on the straight), it was absolutely critical to get shelter. I corner well enough as someone pointed out elsewhere (at 2 to go I really moved up hard, and it was mainly through cornering technique/lines, not sprinting up the side of the field or whatever.

Once you go over a certain height a rim is no longer stiffer, it actually gets more flexible. The Stinger 7 (75mm) is advertised as being more of a sprinter rim with a stiffer rim overall. The 9 (90mm) has no such wording. Apparently (?) the 9 will flex a bit when out of the saddle. On the other hand a 45-60mm rim should be stiffer laterally than those.

All tall rims are pretty stiff vertically, but the tire really makes up for a lot of that.

For the sail effect I'd get a tall rear wheel. Just make sure it doesn't weigh too much.